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Fitness Classes That Keep Heart Rate Top of Mind

OrangeTheory exercise classes use intervals on a rowing machine, treadmill and free weights to produce an ‘afterburn effect’

By

Jen Murphy

June 29, 2015 1:31 p.m. ET

Stacey Kives Bigley thought she was in great shape when she ran her first half marathon in 2012. “I was running all the time,” she recalls. Then, in December 2014, she took her first OrangeTheory class and realized she wasn’t as fit as she thought. “I was sore for three days following the first class,” she says.

OrangeTheory is a boutique fitness studio where the workouts combine rowing, interval training on treadmills and resistance...